The gracious Palace of Fine Arts is a must-see whether you attend a performance, visit an art exhibition or simply take in the spectacular architecture. The art-nouveau building (with pre-Hispanic reliefs) was designed by renowned Italian architect Adamo Boari at the beginning of the 20th century. The interior is decorated with murals by Rivera, Tamayo, Siqueiros and Orozco, and the concert hall has a dazzling beaded-glass stage curtain by Tiffany that depicts the Valley of Mexico. Open to visitors daily except Monday 10 am-6 pm. M$35 adults. Free on Sunday. Ave. Hidalgo 1 (at the eastern end of Alameda Central, Bellas Artes metro station), Centro Historico, Mexico City. Phone 5512-2593. http://www.cnca.gob.mx/cnca/buena/inba/palaciobartes/palacioba.html.